How to check if a php script is still running

Question

I have a PHP script that listens on a queue. Theoretically, it\'s never supposed to die. Is there something to check if it\'s still running? Something like

Answer 1

Just append a second command after the script. When/if it stops, the second command is invoked. Eg.:

php daemon.php 2>&1 | mail -s "Daemon stopped" you@example.org

Edit:

Technically, this invokes the mailer right away, but only completes the command when the php script ends. Doing this captures the output of the php-script and includes in the mail body, which can be useful for debugging what caused the script to halt.